CN105356497B - Main machine round-robin control method of parallel photovoltaic inverter - Google Patents

Main machine round-robin control method of parallel photovoltaic inverter Download PDF

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CN105356497B
CN105356497B CN201510692360.7A CN201510692360A CN105356497B CN 105356497 B CN105356497 B CN 105356497B CN 201510692360 A CN201510692360 A CN 201510692360A CN 105356497 B CN105356497 B CN 105356497B
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photovoltaic
converter
value
inverter
voltage
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CN105356497A (en
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陈聪鹏
曾春保
黄凯伦
颜冰钧
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Xiamen Kehua Hengsheng Co Ltd
Kehua Data Co Ltd
Xiamen Kehua Digital Energy Tech Co Ltd
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Xiamen Kehua Hengsheng Co Ltd
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    • H02J3/383—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to a host round-robin control method of a parallel photovoltaic inverter, which comprises the steps of collecting a photovoltaic pole plate voltage Upv; judging whether the voltage of the photovoltaic polar plate is larger than or equal to the starting voltage Ustart of the inverter, if the voltage Upv of the photovoltaic polar plate is smaller than the starting voltage Ustart of the inverter, reading a cycle value R (k-1) of the last cycle and a cycle value R (k) of the current cycle by each photovoltaic inverter, enabling R (k) = R (k-1), calculating the state value of the photovoltaic inverter, comparing each photovoltaic inverter with the state values of other photovoltaic inverters, and judging whether the state value of each photovoltaic inverter is larger than the state values of the other photovoltaic inverters, if so, operating the photovoltaic inverter in a master mode, and otherwise, operating the photovoltaic inverter in a slave mode. According to the host round-robin control method of the parallel photovoltaic inverter, the service life of each inverter is balanced through system round-robin control, and the working stability of a photovoltaic grid-connected system is improved.

Description

A kind of main frame repeating query control method of parallel photovoltaic DC-to-AC converter
Technical field
The present invention relates to photovoltaic DC-to-AC converter control technology, more particularly to a kind of main frame repeating query of parallel photovoltaic DC-to-AC converter Control method.
Background technology
Increasingly serious with energy shortage and environmental problem, new energy power generation technology is increasingly taken seriously.Concentrating In power supply, in large-sized photovoltaic grid-connected system, using multiple combining inverter independent operatings.Photovoltaic combining inverter is simultaneously Key equipment in net electricity generation system, the reliability and security of inverter influence whether the generated energy and fortune of whole electricity generation system Row stability.
The dormancy control strategy of many parallel systems of existing photovoltaic DC-to-AC converter is mainly：Record parallel system in each it is inverse Become the priority of device power-up sequence, each inverter is closed successively according to the priority sequence of start when needing to control dormancy, accomplish First open and first close, after open after close so that the available machine time of each inverter is essentially identical, consistent in the hope of obtaining each power model life-span Effect.The effect of this control mode will be influenceed by intensity of illumination and weather conditions to a certain extent, if at one section Long-time is in dormant state by power up sequences some machines rearward in possible system when interior intensity of illumination continues weaker. In such case, the part invertor operation time is more long in system, and part inverter may be chronically at resting state or fortune The row time is shorter, and run time is unbalanced between each inverter, so that the life-span length of each inverter is different, this Outward, existing photovoltaic inverting system fails to the probability that intelligent decision each inverter unit breaks down, and with this probability of malfunction Used as inverter the machine is weighed if appropriate for the reference index being incorporated into the power networks, system may frequently run often break down inverse Become device, the above situation may cause the frequent malfunction and failure of grid-connected system and follow-up maintenance work.
The content of the invention
It is existing to overcome it is an object of the invention to provide a kind of main frame repeating query control method of parallel photovoltaic DC-to-AC converter Defect present in technology, is controlled by system repeating query, each life-span of inverter is balanced, to improve the work of photovoltaic parallel in system Make stability.
To achieve the above object, the technical scheme is that：A kind of main frame repeating query control of parallel photovoltaic DC-to-AC converter Method, the parallel photovoltaic DC-to-AC converter includes N platform photovoltaic DC-to-AC converters, and is correspondingly arranged the N platforms photovoltaic DC-to-AC converter respectively IP address value be 1,2,3 ..., N, N >=2 are realized in accordance with the following steps：
Step S1：Collection photovoltaic polar plate voltage Upv；
Step S2：Judge the photovoltaic polar plate voltage whether more than or equal to inverter startup voltage Ustart；If the light Volt polar plate voltage Upv is less than the inverter startup voltage Ustart, then the step S1 is returned to, otherwise, into step S3；
Step S3：Every photovoltaic DC-to-AC converter obtains cycle repeating query value R (k-1) respectively, and makes current period repeating query value R (k)=R (k-1)；
Step S4：The state value of a photovoltaic DC-to-AC converter in the parallel photovoltaic DC-to-AC converter is calculated,
State value=(running status * A1)+(malfunction * A2)+(current period repeating query value * A3)+(principal and subordinate value * A4),
Wherein, A1 is the first weight, and A2 is the second weight, and A3 is the 3rd weight, and A4 is the 4th weight, and A1 ＞ 2* (A2+ A3)+A4, A2 ＞ (2*A3)+A4, A3 ＞ A4；
Step S5：Obtain the state of the photovoltaic DC-to-AC converter and other photovoltaic DC-to-AC converters in the parallel photovoltaic DC-to-AC converter Value, whether the state value for judging this TV station photovoltaic DC-to-AC converter is maximum, if the state value of this TV station photovoltaic DC-to-AC converter is maximum, is entered Step S6, otherwise this TV station photovoltaic DC-to-AC converter are run with slave mode；
Step S6：Judge the photovoltaic DC-to-AC converter state value whether with other photovoltaics in the parallel photovoltaic DC-to-AC converter The state value of inverter is identical, if without equal state value, this TV station photovoltaic DC-to-AC converter is run with host mode, otherwise into step S7；
Step S7：This TV station photovoltaic DC-to-AC converter adds up grid-connected duration in reading past n days that the photovoltaic DC-to-AC converter is recorded, And compare with other photovoltaic DC-to-AC converters in the parallel photovoltaic DC-to-AC converter, if a length of minimum during this TV station photovoltaic inverter grid-connected Value, then into step S8, otherwise into step S4；
Step S8：R (k')=R (k) is made, current period repeating query value R (k) is changed to R (k')+(photovoltaic is inverse Become the IP address/N of device), return to step S4.
In an embodiment of the present invention, in the step S4, the calculation procedure of the malfunction is：
Step S41：Read the photovoltaic DC-to-AC converter number of stoppages a of n days before the photovoltaic DC-to-AC converter1、a2…anAnd it is described simultaneously The failure total degree b of n days before connection formula photovoltaic DC-to-AC converter1、b2…bn, and with n-z days for a unit period, calculate the photovoltaic Mean failure rate number of times Eavg in inverter each unit period1、Eavg2...Eavgz,
…
Wherein, z ＜ n；
Step S42：According to unit period number z structural matrixes [P1 P2 … Pz], and the element P in the matrixiRepresent i-th The fault right weight of individual unit period, 1≤i≤z, wherein,
Pi=iKbase
KbaseIt is fault right weight coefficient, and 1 ＜ Kbase＜ 2；
Step S43：According to mean failure rate number of times Eavg in described each unit period of parallel photovoltaic DC-to-AC converter1、 Eavg2...EavgzWith the z fault right weight [P of unit period1 P2 … Pz] calculate probability of malfunction M：
Step S44：According to probability of malfunction M, malfunction Q is calculated in the following way：When M ∈ [0,0.2), Q=2；Work as M ∈ [0.2,0.8), Q=1；When M ∈ [0.8,1.0], Q=0.
In an embodiment of the present invention, in the step S5, the slave mode operation is realized in accordance with the following steps：
Step S51：Whether the photovoltaic polar plate voltage Upv is judged less than the inverter startup voltage Ustart, if institute Photovoltaic polar plate voltage Upv is not less than the inverter startup voltage Ustart, then the photovoltaic DC-to-AC converter of slave continues to be incorporated into the power networks, Otherwise enter step S52；
Step S52：Slave disconnects grid-connected, shutdown.
In an embodiment of the present invention, in the step S6, the host mode operation is realized in accordance with the following steps：
Step S61：Whether the photovoltaic polar plate voltage Upv is judged less than the inverter startup voltage Ustart, if institute Photovoltaic polar plate voltage Upv is stated not less than the inverter startup voltage Ustart, is then continued simultaneously as the photovoltaic DC-to-AC converter of main frame Network operation, otherwise into step S63；
Step S62：Judge whether other have all shut down as the photovoltaic DC-to-AC converter of slave, if other slaves are not also complete Portion shuts down, then continue waiting for slave shutdown, until slave all shuts down, and enters step S64；
Step S63：The main frame disconnection is grid-connected, runs in the standby mode；
Step S64：Whether the photovoltaic polar plate voltage Upv is judged less than inverter start voltage Uon, if the photovoltaic pole Not less than inverter start voltage Uon, then return to step S64, runs plate voltage Upv in the standby mode, otherwise enters step Rapid S65；
Step S65：Make R (k)=0, the main frame shutdown；
Wherein, 240V ＜ Uon ＜ Ustart.
In an embodiment of the present invention, the inverter startup voltage Ustart ＞ 515V, and inverter startup electricity Open-circuit voltages of the pressure Ustart less than the photovoltaic polar plate.
In an embodiment of the present invention, in the step S4, if photovoltaic DC-to-AC converter is in host mode in current period Operation, then principal and subordinate's value value is 1, and otherwise, principal and subordinate's value value is 0.
In an embodiment of the present invention, in the step S4, when the photovoltaic DC-to-AC converter runs, the running status Value is 2；When the photovoltaic DC-to-AC converter is standby, the running status value is 1；When the photovoltaic DC-to-AC converter failure, institute It is 0 to state running status value.
In an embodiment of the present invention, if photovoltaic DC-to-AC converter was run using host mode in current period, currently Cycle repeating query value value is 0；Otherwise, current period repeating query value value be 1 or R (k')+(IP address of the photovoltaic DC-to-AC converter/ N)。
Compared to prior art, the invention has the advantages that：A kind of parallel photovoltaic proposed by the invention is inverse Become the main frame repeating query control method of device, by the way of main frame repeating query, without fixed power up sequences, and be intelligently divided into principal and subordinate Machine；Main frame is produced using repeating query mode, and every inverter voluntarily recognizes operational mode, and main frame is first started shooting during start every time, dormancy The dormancy of Shi Congji elder generations, a slave is carried out per 24h and is changed and repeating query, the balanced each host mode run time of inverter, Reduce the aging variation between each inverter, and the probability that intelligent decision each inverter unit breaks down, and with this Probability of malfunction improves the use of whole grid-connected system as inverter the machine is weighed if appropriate for the reference index being incorporated into the power networks In the life-span, reducing causes the possibility of whole system failure due to single inverter failure, and reduces plant maintenance work.
Brief description of the drawings
Fig. 1 is the flow chart of the main frame repeating query control method of parallel photovoltaic DC-to-AC converter in the present invention.
Fig. 2 is the flow chart run with host mode in the present invention.
Fig. 3 is with the flow chart of slave machine mode operation in the present invention；
Specific embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
The present invention provides a kind of main frame repeating query control method of parallel photovoltaic DC-to-AC converter, the parallel photovoltaic DC-to-AC converter Including N platform photovoltaic DC-to-AC converters, and be correspondingly arranged respectively the IP address value of the N platforms photovoltaic DC-to-AC converter for 1,2,3 ..., N, N >=2, As shown in figure 1, realizing in accordance with the following steps：
Step S1：Collection photovoltaic polar plate voltage Upv；
Step S2：Judge the photovoltaic polar plate voltage whether more than or equal to inverter startup voltage Ustart；If the light Volt polar plate voltage Upv is less than the inverter startup voltage Ustart, then the step S1 is returned to, otherwise, into step S3；
Step S3：Every photovoltaic DC-to-AC converter obtains cycle repeating query value R (k-1) respectively, and makes current period repeating query value R (k)=R (k-1)；
Step S4：The state value of a photovoltaic DC-to-AC converter in the parallel photovoltaic DC-to-AC converter is calculated,
State value=(running status * A1)+(malfunction * A2)+(current period repeating query value * A3)+(principal and subordinate value * A4),
Wherein, A1 is the first weight, and A2 is the second weight, and A3 is the 3rd weight, and A4 is the 4th weight, and A1 ＞ 2* (A2+ A3)+A4, A2 ＞ (2*A3)+A4, A3 ＞ A4；
In the present embodiment, if photovoltaic DC-to-AC converter runs in host mode in current period, the principal and subordinate is worth value It is 1, otherwise, principal and subordinate's value value is 0；
When the photovoltaic DC-to-AC converter runs, the running status value is 2；When the photovoltaic DC-to-AC converter is standby, institute It is 1 to state running status value；When the photovoltaic DC-to-AC converter failure, the running status value is 0.
Step S5：Obtain the state of the photovoltaic DC-to-AC converter and other photovoltaic DC-to-AC converters in the parallel photovoltaic DC-to-AC converter Value, whether the state value for judging this TV station photovoltaic DC-to-AC converter is maximum, if the state value of this TV station photovoltaic DC-to-AC converter is maximum, is entered Step S6, otherwise this TV station photovoltaic DC-to-AC converter are run with slave mode；
Step S6：Judge the photovoltaic DC-to-AC converter state value whether with other photovoltaics in the parallel photovoltaic DC-to-AC converter The state value of inverter is identical, if without equal state value, this TV station photovoltaic DC-to-AC converter is run with host mode, otherwise into step S7；
Step S7：This TV station photovoltaic DC-to-AC converter adds up grid-connected duration in reading past n days that the photovoltaic DC-to-AC converter is recorded, And compare with other photovoltaic DC-to-AC converters in the parallel photovoltaic DC-to-AC converter, if a length of minimum during this TV station photovoltaic inverter grid-connected Value, then into step S8, otherwise into step S4；
Step S8：R (k')=R (k) is made, current period repeating query value R (k) is changed to R (k')+(photovoltaic is inverse Become the IP address/N of device), return to step S4；
If photovoltaic DC-to-AC converter had become main frame in current period, current period repeating query value value is 0, otherwise preceding cycle Repeating query value value is the IP address/N of 1 or R (k')+photovoltaic DC-to-AC converter)；
Further, in the present embodiment, the inverter startup voltage Ustart ＞ 515V, and the inverter startup Open-circuit voltages of the voltage Ustart less than the photovoltaic polar plate.
Further, in the present embodiment, in the step S4, the calculation procedure of the malfunction is：
Step S41：Read the photovoltaic DC-to-AC converter number of stoppages a of n days before the photovoltaic DC-to-AC converter1、a2…anAnd it is described simultaneously The failure total degree b of n days before connection formula photovoltaic DC-to-AC converter1、b2…bn, and with n-z days for a unit period, calculate the photovoltaic Mean failure rate number of times Eavg in inverter each unit period1、Eavg2...Eavgz,
…
Wherein, z ＜ n；
Step S42：According to unit period number z structural matrixes [P1 P2 … Pz], and the element P in the matrixiRepresent i-th The fault right weight of individual unit period, 1≤i≤z, wherein,
Pi=iKbase
KbaseIt is fault right weight coefficient, and 1 ＜ Kbase＜ 2；
Step S43：According to mean failure rate number of times Eavg in described each unit period of parallel photovoltaic DC-to-AC converter1、 Eavg2...EavgzWith the z fault right weight [P of unit period1 P2 … Pz] calculate probability of malfunction M：
Step S44：According to probability of malfunction M, malfunction Q is calculated by looking into following table mode；
M ∈ [0,0.2) M ∈ [0.2,0.8) M ∈ [0.8,1.0]
Q=2 Q=1 Q=0
Further, in the present embodiment, in the step S5, as shown in figure 3, slave mode operation is according to such as Lower step is realized：
Step S51：Whether the photovoltaic polar plate voltage Upv is judged less than the inverter startup voltage Ustart, if institute Photovoltaic polar plate voltage Upv is not less than the inverter startup voltage Ustart, then continue grid-connected as the photovoltaic DC-to-AC converter of slave Operation, otherwise into step 52；
Step S52：Slave disconnects grid-connected, shutdown.
Further, in the present embodiment, the inverter startup voltage Ustart takes 520V, namely slave mode operation Comprise the following steps：
Step S51, judges that whether Upv, less than 520V, if Upv is not less than 520V, continues grid-connected utilization, otherwise enters step Rapid 52；
Step S52, slave disconnects grid-connected, shutdown.
Further, in the present embodiment, in the step S6, as shown in Fig. 2 host mode operation is according to such as Lower step is realized：
Step S61：Whether the photovoltaic polar plate voltage Upv is judged less than the inverter startup voltage Ustart, if institute Photovoltaic polar plate voltage Upv is stated not less than the inverter startup voltage Ustart, is then continued simultaneously as the photovoltaic DC-to-AC converter of main frame Network operation, otherwise into step S63；
Step S62：Judge whether other have all shut down as the photovoltaic DC-to-AC converter of slave, if other slaves are not also complete Portion shuts down, then continue waiting for slave shutdown, until slave all shuts down, and enters step S64；
Step S63：The main frame disconnection is grid-connected, runs in the standby mode；
Step S64：Whether the photovoltaic polar plate voltage Upv is judged less than inverter start voltage Uon, if the photovoltaic pole Not less than inverter start voltage Uon, then return to step S64, runs plate voltage Upv in the standby mode, otherwise enters step Rapid S65；
Step S65：Make R (k)=0, the main frame shutdown；
Wherein, 240V ＜ Uon ＜ Ustart.
Further, in the present embodiment, the inverter startup voltage Ustart takes 520V, the inverter start electricity Pressure Uon takes 350V, namely host mode operation is comprised the following steps：
Step S61：Whether photovoltaic polar plate voltage Upv is judged less than 520V, if Upv is not less than 520V, main frame continues simultaneously Network operation, otherwise into step S63；
Step S62：Judge whether other have all shut down as the photovoltaic DC-to-AC converter of slave, if other slaves are not also complete Portion shuts down, then continue waiting for slave shutdown, until slave all shuts down, into step S64；
Step S63：Main frame disconnection is grid-connected, runs in the standby mode；
Step S64：, whether Upv is judged less than inverter start voltage 350V, if Upv is not less than 350V, return to step S64, runs in the standby mode, otherwise into step S65；
Step S65：Make R (k)=0, main frame shutdown；
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, produced function work During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.

Claims (4)

1. a kind of main frame repeating query control method of parallel photovoltaic DC-to-AC converter, the parallel photovoltaic DC-to-AC converter includes N platform photovoltaics Inverter, and be correspondingly arranged respectively the IP address value of the N platforms photovoltaic DC-to-AC converter for 1,2,3 ..., N, N >=2, it is characterised in that Realize in accordance with the following steps：
Step S1：Collection photovoltaic polar plate voltage Upv；
Step S2：Judge the photovoltaic polar plate voltage whether more than or equal to inverter startup voltage Ustart；If the photovoltaic pole Plate voltage Upv is less than the inverter startup voltage Ustart, then the step S1 is returned to, otherwise, into step S3；
Step S3：Every photovoltaic DC-to-AC converter obtains cycle repeating query value R (k-1) respectively, and makes current period repeating query value R (k) =R (k-1)；
Step S4：The state value of a photovoltaic DC-to-AC converter in the parallel photovoltaic DC-to-AC converter is calculated,
State value=(running status * A1)+(malfunction * A2)+(current period repeating query value * A3)+(principal and subordinate value * A4),
Wherein, A1 is the first weight, and A2 is the second weight, and A3 is the 3rd weight, and A4 is the 4th weight, and A1 ＞ 2* (A2+A3)+ A4, A2 ＞ (2*A3)+A4, A3 ＞ A4；
Step S5：The state value of the photovoltaic DC-to-AC converter and other photovoltaic DC-to-AC converters in the parallel photovoltaic DC-to-AC converter is obtained, Whether the state value for judging this TV station photovoltaic DC-to-AC converter is maximum, if the state value of this TV station photovoltaic DC-to-AC converter is maximum, enters step Rapid S6, otherwise this TV station photovoltaic DC-to-AC converter are run with slave mode；
Step S6：Judge the photovoltaic DC-to-AC converter state value whether with other photovoltaic inversions in the parallel photovoltaic DC-to-AC converter The state value of device is identical, if without equal state value, this TV station photovoltaic DC-to-AC converter is run with host mode, otherwise into step S7；
Step S7：Read this TV station photovoltaic DC-to-AC converter in past n days that the photovoltaic DC-to-AC converter recorded and add up grid-connected duration, and with Other photovoltaic DC-to-AC converters compare in the parallel photovoltaic DC-to-AC converter, if a length of minimum value during this TV station photovoltaic inverter grid-connected, Into step S8, otherwise into step S4；
Step S8：If photovoltaic DC-to-AC converter was run using host mode in current period, by the current period repeating query value Value is 0；Otherwise, it is 1 by the current period repeating query value value, or makes R (k')=R (k), and by the current period repeating query Value R (k) is changed to R (k')+(IP address/N of the photovoltaic DC-to-AC converter), return to step S4；
In the step S4, the calculation procedure of the malfunction is：
Step S41：Read the photovoltaic DC-to-AC converter number of stoppages a of n days before the photovoltaic DC-to-AC converter1、a2…anAnd it is described parallel The failure total degree b of n days before photovoltaic DC-to-AC converter1、b2…bn, and with n-z days for a unit period, calculate the photovoltaic inversion Mean failure rate number of times Eavg in device each unit period1、Eavg2...Eavgz,
Eavg 1 = 1 ( n - z ) a 1 a 2 ... a ( n - z ) 1 b 1 1 b 2 ... 1 b ( n - z ) T ,
Eavg 2 = 1 ( n - z ) a 2 a 3 ... a ( n - z + 1 ) 1 b 2 1 b 3 ... 1 b ( n - z + 1 ) T ,
…
Eavg z = 1 ( n - z ) a z a Z + 1 ... a n - 1 1 b z 1 b Z + 1 ... 1 b n - 1 T , Wherein, z ＜ n；
Step S42：According to unit period number z structural matrixes [P1 P2 … Pz], and the element P in the matrixi, 1≤i≤z, table Show i-th fault right weight of unit period, wherein,
Pi=iKbase
KbaseIt is fault right weight coefficient, and 1 ＜ Kbase＜ 2；
Step S43：According to mean failure rate number of times Eavg in described each unit period of parallel photovoltaic DC-to-AC converter1、 Eavg2...EavgzWith the z fault right weight [P of unit period1 P2 … Pz] calculate probability of malfunction M：
M = 2 z · Eavg 1 Eavg 2 ... Eavg z P 1 P 2 ... P z T K b a s e · ( z + 1 ) ;
Step S44：According to probability of malfunction M, malfunction Q is calculated in the following way：When M ∈ [0,0.2), Q=2；As M ∈ [0.2,0.8), Q=1；When M ∈ [0.8,1.0], Q=0；
In the step S4, if photovoltaic DC-to-AC converter runs in host mode in current period, principal and subordinate's value value is 1, otherwise, principal and subordinate's value value is 0；
In the step S4, when the photovoltaic DC-to-AC converter runs, the running status value is 2；When the photovoltaic inversion When device is standby, the running status value is 1；When the photovoltaic DC-to-AC converter failure, the running status value is 0.
2. the main frame repeating query control method of a kind of parallel photovoltaic DC-to-AC converter according to claim 1, it is characterised in that In the step S5, the slave mode operation is realized in accordance with the following steps：
Step S51：Whether the photovoltaic polar plate voltage Upv is judged less than the inverter startup voltage Ustart, if institute's photovoltaic Polar plate voltage Upv is not less than the inverter startup voltage Ustart, then the photovoltaic DC-to-AC converter of slave continues to be incorporated into the power networks, otherwise Into step S52；
Step S52：Slave disconnects grid-connected, shutdown.
3. the main frame repeating query control method of a kind of parallel photovoltaic DC-to-AC converter according to claim 1, it is characterised in that In the step S6, the host mode operation is realized in accordance with the following steps：
Step S61：Whether the photovoltaic polar plate voltage Upv is judged less than the inverter startup voltage Ustart, if the light Volt polar plate voltage Upv is not less than the inverter startup voltage Ustart, then continue grid-connected fortune as the photovoltaic DC-to-AC converter of main frame OK, otherwise into step S63；
Step S62：Judge whether other have all shut down as the photovoltaic DC-to-AC converter of slave, if other slaves are not closed all also Machine, then continue waiting for slave shutdown, until slave all shuts down, and enters step S64；
Step S63：The main frame disconnection is grid-connected, runs in the standby mode；
Step S64：Whether the photovoltaic polar plate voltage Upv is judged less than inverter start voltage Uon, if the photovoltaic polar plate is electric Not less than inverter start voltage Uon, then return to step S64, runs pressure Upv in the standby mode, otherwise into step S65；
Step S65：Make R (k)=0, the main frame shutdown；
Wherein, 240V ＜ Uon ＜ Ustart.
4. the main frame repeating query control method of a kind of parallel photovoltaic DC-to-AC converter according to claim 1,2 or 3, its feature exists In, the inverter startup voltage Ustart ＞ 515V, and the inverter startup voltage Ustart is less than the photovoltaic polar plate Open-circuit voltage.
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